Integrating Sales CRM software(Online) with Dynamic CRM ONline

Hello Genius People,

My Company wants to Integrate a third party Sales CRM Software(Online) with Dynamic CRM online.


Please help/Suggest some ideas -(PS.. I am Stil a Noob in Dynamic CRM World)

1) How do i integrate them?(using which technology)

2)We need a Sign on Authentication Such as if a User of Dynamic CRM online Logins,he needs to login to Sales CRM also.(How do i achive this?By what method?)

I hope you Guys understood the Scenario.

Please provide me resources or tutorials related to this matter. If there is any information on Integration of Dynamic crm online with Other crm Software, Please refer!

Waiting for Reply 

Thank you :)